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(No Model.)

G. H. OGI'LVY. COMPOUND TUBULAR SHAFTING.

No. 429,175. Patented June 3, 1890.

UNITED STATES PATENT OEEIcE.

GEORGE H. OGlLVY, on NEW YORK, N. Y.

COMPOUND TUBULAR SHAFTING.

SPECIFICATION forming part of Letters Patent No. 429,175, dated June 3,1890.

' Application filed January 10, 1890- Serial No. 336,573. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE H. OGILVY, residing at New York, in thecounty of New York and State of New York, have invented certain new anduseful Improvements in Conipound Tubular Shafting, of which the following is a specification, reference being had therein to the accompanyingdrawings.

This invention relates to the construction of heavy shafting forsteamboat-s and the like.

The object of my invention is to produce a compound shaft the separateparts of which shall be firmly locked together. The separate parts aremuch easier to fabricate than would be a single mass of metal, and theliability of serious defects in the shaft are largely diminished byreason of the parts being accessible for closer inspection than if theshaft were made in a mass.

Figure 1 is a perspective of a blank from which one section of the shaftmay be made. Fig. 2 is a broken perspective view of the blank rolled orforged into a trough. Fig. 3 is a broken perspective view of theshaft-section formed for coupling. Figs. 4c and 5 are face views of thetwo shaft-sections, and Figs. 6 and 7 are side elevations of the same.Fig. 8 is a perspective of the completed shaft with retaining rings orbands.

A indicates a blank, preferably of steel or wrought-iron. The blank maybe rectangular in section, but by preference the edges B will bebeveled, as shown. The blank will be a little wider than thehalf-circumference of the proposed shaft. The blank is heated and drawn,rolled, or forged into the form of a trough, as at O. This trough willbe a little more than a half-circle of about the proposed diameter ofthe shaft. The face of blank 0 is planed up by a planing-machine to theform D. (Shown in Fig. 3.) The plane faces E are a little above thecenter of the are forming the center of the shaft, while the faces F arebelow said center. The faces F are made by planing transversely of thepart D, and by preference the faces E and F are of equal length. Twoshaft-sections D are made, as in Figs. 4 and 8, the depressed portions Fin one section corresponding with the elevated portions E of the other.The shaft-sections may be made exact counterparts, as shown, and thereversal of the ends will bring the two sections into matching relationwith each other. The projections E, extending into spaces F, willinterlock, being complementary to each other. The sections D will bemore than a half-circle, if measured around from E to E, and less than ahalf-circle from F to F to give best results.

WVhen the two parts are turned together, as shown in Fig. 8, they aresecured by hoops or rings G, which may be shrunk or forced on. As manyhoops or rings may be applied as convenient, and these hoops may be ofconsiderable thickness and great strength, as they can be arranged so asto come between the shaft-bearings.

The shaft-section can be made to tightly fit, so that water may becirculated through the hollow center.

The sections D, for large shafts, can be fabricated by much lightermachines than would be required to work the great masses of metalrequired for such solid shafts as are used in steamships. Furthermore,as both the outer and inner faces of the shaft-section are open toinspection any imperfection in the metal is almost sure to bediscovered.

The shaft-sections will be held against (letachnient by thebearing-boxes, as well as by the rings, and any desirable form of boxesmay be used.

hat I claim is 1. The method of making shafting, which consists inbending plates into curved sec tions, cutting away the edges of two suchsections into alternate projections and depressions, turning the edgesof the two sections together, so that the projections will intermesh,and securin the parts together by confining-bands, substantially asdescribed.

2. The shaftdescribed, consisting of nearly semi-tubular sections withprojections and depressions on their plane faces, said faces turnedtogether, so that the projections interniesh, and having confining ringsor bands, in combination, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE H. OGILVY.

Witnesses:

DELIA V. QUINLAN, Louis HOLLANDER.

